A La Nina increases the probability of above-average rainfall, of up to 80 per cent for Dubbo according to the BOM, but Dubbo agronomist Glenn Shepherd said it is not a certainty that it will rain.

"It's (La Nina) something we certainly look at, but there are not too many decisions we actually make immediately in terms of, are we going to utilise that knowledge," Mr Shepherd said.

"You have to be careful with how you utilise that knowledge

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"The thing about La Nina is that it doesn't mean that we're definitely going to get more rain, it's just an increased probability."

Mr Shepherd said the biggest issue farmers could be facing is if it starts raining in the next eight weeks, which could potentially cause issues in the harvesting of some of the regions winter crops.

Winter crops commonly include wheat, barley, oats and triticale, oilseeds such as canola, mustard and safflower and pulses such as lupins, chickpeas, faba beans and field peas.

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"Some of the more southern lesion crops will certainly benefit from rain later this month, but it has to rain pretty soon to benefit the winter crops as it's reaching its maturity," Mr Shepherd said.

"The bigger issues will probably be harvest logistics and actually getting onto the paddock to harvest if we start to get a lot of rain.

"We never knock back the rain, but there's a lot of winter crop out there in the paddock at the moment and if we don't get it off in a timely fashion we get a lot of downgrades, and that could have a highly negative impact on returns.

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"The majority in this area is winter cropping, in terms of dry land summer crops, we don't actually have a lot of it.

"It will certainly provide opportunities in regards to cropping in small areas and will be beneficial for that.

"In simplest of terms, if it starts raining mid-December onwards, that would probably be fantastic, if it rains in the next three weeks, or probably after December it's probably going to be very beneficial throughout various areas across our region, but from October to mid-December it's going to be more of a negative than a positive for logistical reasons."